A portable cooling unit is disclosed for vacuum cooling products such as product at a worksite such as a field where the produce is harvested. When cooling product, the portable cooling unit includes a retort, at least one shuttle coupled to the retort and a condensation assembly. The condensation assembly includes primary and secondary refrigerant load subassemblies. Each of these components may be disassembled from each other into modular units which may be easily transported to and from the worksite.
